UBOOT中Boot_init.c关于从NAND拷贝代码到SDRAM
在函数int nand_read_ll_lp(unsigned char *buf, unsigned long start_addr, int size)里有这样一段代码/* Check Bad Block */
if(1){
int col, page;
col = i & NAND_BLOCK_MASK_LP;
page = i / NAND_SECTOR_SIZE_LP;
write_cmd(0x00);
*p = 5;
for(j=0; j<10; j++);
*p = 8;
for(j=0; j<10; j++);
*p = page & 0xff; /* Row Address A12~A19 */
for(j=0; j<10; j++);
*p = (page >> 8) & 0xff; /* Row Address A20~A27 */
for(j=0; j<10; j++);
if (b128MB == 0)
*p = (page >> 16) & 0x03; /* Row Address A28~A29 */
for(j=0; j<10; j++);
write_cmd(0x30);
wait_idle();
dat = read_data();
nand_deselect_chip();
if(dat != 0xff)
i += 131072; // 1 Block = 2048*64= 131072
/* Read Page */
nand_select_chip();
}
问题1： *p = 5;
for(j=0; j<10; j++);
*p = 8;
for(j=0; j<10; j++);这个地址是怎么来的？
问题2：如果检测到是坏块，这里面也没看到做什么处理？
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